Marin Mersenne 2^P-1
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GIMPS
Finding World Record Primes Since 1996

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MnStatusDetails
1942273Composite, with 1 known prime factor. Cofactor is composite.
Factored
FactorDigitsBitsDate
340699935268128929834530686252635164966340131.32023-04-07 15:39:06
ECM
DigitsB1Curves
2550000280 / 280
30250000106 / 640
Estimated T-Level: 25.8
TF below 2^81 is very unlikely to find new factors due to ECM effort.
LL
StatusDateUserResidueShift
Verified (Factored)phil kenny6C48DD345D8368390
Verified (Factored)1998-12-21David Phillips6C48DD345D8368391145474
Verified (Factored)1999-01-02David Phillips6C48DD345D836839984376
Verified (Factored)2016-04-30kkmrkkblmbrbk6C48DD345D8368391663310
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified2023-04-08RichD0AD1A57751B7E81B4151256953
P-1 factors
DateFactorB1B2
2023-04-07340699935268128929834530686252635164966350000000256102416570
History
DateUserTypeResult
2023-04-08curtiscCERT
PRP Certification
Proof certified good
2023-04-08RichD0C-PRP
M1942273/3406999352681289298345306862526351649663 : AD1A57751B7E81B4
PRP proof power = 7
PRP: Verified
Proof certified good
2023-04-07RichD0F-PM1
Factor: 3406999352681289298345306862526351649663 / (P-1, B1=50000000, B2=256102416570)
2022-08-16masserNF-PP1
Start=2/7, B1=1500000, B2=54000000
2022-08-06Wentao HuangNF-PM1
B1=2340000, B2=10302160050
2019-05-11chuenkitNF
no factor from 2^67 to 2^68
2018-09-17JossNF-PM1
B1=1942273, B2=194227300, E=12
2018-02-28JossNF-PM1
B1=1942273, B2=113248640, E=12
2018-02-11JossNF-PM1
B1=1942273, B2=56624320, E=12
2018-02-04JossNF-PM1
B1=1942273, B2=28312160, E=12
2017-11-10TJAOINF
no factor from 2^66 to 2^67
2017-04-12JossNF-PM1
B1=1415608, B2=14156080, E=12
2017-01-22JossNF-PM1
B1=1179674
2017-01-04JossNF-PM1
B1=983062
2016-12-24JossNF-PM1
B1=819219
2016-12-16JossNF-PM1
B1=682683
2016-12-15JossNF-PM1
B1=568903
2016-04-30kkmrkkblmbrbkC-LL
6C48DD345D836839
2016-02-23Mark RoseNF
no factor from 2^62 to 2^63
2016-02-23Mark RoseNF
no factor from 2^61 to 2^62
2016-02-23Mark RoseNF
no factor from 2^58 to 2^60
2015-10-08Bruno VictalNF-PM1
B1=500000, B2=15000000, E=12
2015-09-05ramgeisNF
no factor from 2^65 to 2^66
2015-05-05lycornNF
no factor from 2^64 to 2^65
2015-05-05lycornNF
no factor from 2^63 to 2^64
2011-12-11markrNF-PM1
B1=275000, B2=6000000, E=12
2011-08-27GrunwalderGIMPNF
no factor from 2^1 to 2^63
2010-01-26S485122NF
no factor from 2^60 to 2^61